It depends
partially on the quality of the server, but also the community..
if it stays up long enough, and it's my type of server (one that i enjoy playing, not painfully slow lvlin) and my m8's play, i'll stick at it.. if my m8's leave, i usually leave. i think it's because i don't really play the game for the game, i play it to chat.. on euro it took me a year to do lvl 29-30, because all i ever did was talk and pvp lol